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Conduit is a simple, fast and reliable chat server powered by Matrix https://conduit.rs
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conduit/src/client_server/sync.rs

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use super::State;
use crate::{ConduitResult, Database, Error, Ruma};
use ruma::{
api::client::r0::sync::sync_events,
events::{room::member::MembershipState, AnySyncEphemeralRoomEvent, EventType},
Raw, RoomId, UserId,
};
#[cfg(feature = "conduit_bin")]
use rocket::{get, tokio};
use std::{
collections::{hash_map, BTreeMap, HashMap, HashSet},
convert::TryFrom,
time::Duration,
};
#[cfg_attr(
feature = "conduit_bin",
get("/_matrix/client/r0/sync", data = "<body>")
)]
pub async fn sync_events_route(
db: State<'_, Database>,
body: Ruma<sync_events::Request>,
) -> ConduitResult<sync_events::Response> {
let sender_id = body.sender_id.as_ref().expect("user is authenticated");
let device_id = body.device_id.as_ref().expect("user is authenticated");
// TODO: match body.set_presence {
db.rooms.edus.ping_presence(&sender_id)?;
// Setup watchers, so if there's no response, we can wait for them
let watcher = db.watch(sender_id, device_id);
let next_batch = db.globals.current_count()?.to_string();
let mut joined_rooms = BTreeMap::new();
let since = body
.since
.clone()
.and_then(|string| string.parse().ok())
.unwrap_or(0);
let mut presence_updates = HashMap::new();
let mut left_encrypted_users = HashSet::new(); // Users that have left any encrypted rooms the sender was in
let mut device_list_updates = HashSet::new();
let mut device_list_left = HashSet::new();
// Look for device list updates of this account
device_list_updates.extend(
db.users
.keys_changed(&sender_id.to_string(), since, None)
.filter_map(|r| r.ok()),
);
for room_id in db.rooms.rooms_joined(&sender_id) {
let room_id = room_id?;
let mut non_timeline_pdus = db
.rooms
.pdus_since(&sender_id, &room_id, since)?
.filter_map(|r| r.ok()); // Filter out buggy events
// Take the last 10 events for the timeline
let timeline_pdus = non_timeline_pdus
.by_ref()
.rev()
.take(10)
.collect::<Vec<_>>()
.into_iter()
.rev()
.collect::<Vec<_>>();
let send_notification_counts = !timeline_pdus.is_empty();
// They /sync response doesn't always return all messages, so we say the output is
// limited unless there are events in non_timeline_pdus
let mut limited = false;
let mut state_pdus = Vec::new();
for pdu in non_timeline_pdus {
if pdu.state_key.is_some() {
state_pdus.push(pdu);
}
limited = true;
}
let encrypted_room = db
.rooms
.room_state_get(&room_id, &EventType::RoomEncryption, "")?
.is_some();
// TODO: optimize this?
let mut send_member_count = false;
let mut joined_since_last_sync = false;
let mut new_encrypted_room = false;
for (state_key, pdu) in db
.rooms
.pdus_since(&sender_id, &room_id, since)?
.filter_map(|r| r.ok())
.filter_map(|pdu| Some((pdu.state_key.clone()?, pdu)))
{
if pdu.kind == EventType::RoomMember {
send_member_count = true;
let content = serde_json::from_value::<
Raw<ruma::events::room::member::MemberEventContent>,
>(pdu.content.clone())
.expect("Raw::from_value always works")
.deserialize()
.map_err(|_| Error::bad_database("Invalid PDU in database."))?;
if pdu.state_key == Some(sender_id.to_string())
&& content.membership == MembershipState::Join
{
joined_since_last_sync = true;
} else if encrypted_room && content.membership == MembershipState::Join {
// A new user joined an encrypted room
let user_id = UserId::try_from(state_key)
.map_err(|_| Error::bad_database("Invalid UserId in member PDU."))?;
// Add encryption update if we didn't share an encrypted room already
if !share_encrypted_room(&db, &sender_id, &user_id, &room_id) {
device_list_updates.insert(user_id);
}
} else if encrypted_room && content.membership == MembershipState::Leave {
// Write down users that have left encrypted rooms we are in
left_encrypted_users.insert(
UserId::try_from(state_key)
.map_err(|_| Error::bad_database("Invalid UserId in member PDU."))?,
);
}
} else if pdu.kind == EventType::RoomEncryption {
new_encrypted_room = true;
}
}
if joined_since_last_sync && encrypted_room || new_encrypted_room {
// If the user is in a new encrypted room, give them all joined users
device_list_updates.extend(
db.rooms
.room_members(&room_id)
.filter_map(|user_id| {
Some(
UserId::try_from(user_id.ok()?.clone())
.map_err(|_| {
Error::bad_database("Invalid member event state key in db.")
})
.ok()?,
)
})
.filter(|user_id| {
// Don't send key updates from the sender to the sender
sender_id != user_id
})
.filter(|user_id| {
// Only send keys if the sender doesn't share an encrypted room with the target already
!share_encrypted_room(&db, sender_id, user_id, &room_id)
}),
);
}
// Look for device list updates in this room
device_list_updates.extend(
db.users
.keys_changed(&room_id.to_string(), since, None)
.filter_map(|r| r.ok()),
);
let (joined_member_count, invited_member_count, heroes) = if send_member_count {
let joined_member_count = db.rooms.room_members(&room_id).count();
let invited_member_count = db.rooms.room_members_invited(&room_id).count();
// Recalculate heroes (first 5 members)
let mut heroes = Vec::new();
if joined_member_count + invited_member_count <= 5 {
// Go through all PDUs and for each member event, check if the user is still joined or
// invited until we have 5 or we reach the end
for hero in db
.rooms
.all_pdus(&sender_id, &room_id)?
.filter_map(|pdu| pdu.ok()) // Ignore all broken pdus
.filter(|pdu| pdu.kind == EventType::RoomMember)
.map(|pdu| {
let content = serde_json::from_value::<
Raw<ruma::events::room::member::MemberEventContent>,
>(pdu.content.clone())
.expect("Raw::from_value always works")
.deserialize()
.map_err(|_| Error::bad_database("Invalid member event in database."))?;
if let Some(state_key) = &pdu.state_key {
let user_id = UserId::try_from(state_key.clone()).map_err(|_| {
Error::bad_database("Invalid UserId in member PDU.")
})?;
// The membership was and still is invite or join
if matches!(
content.membership,
MembershipState::Join | MembershipState::Invite
) && (db.rooms.is_joined(&user_id, &room_id)?
|| db.rooms.is_invited(&user_id, &room_id)?)
{
Ok::<_, Error>(Some(state_key.clone()))
} else {
Ok(None)
}
} else {
Ok(None)
}
})
.filter_map(|u| u.ok()) // Filter out buggy users
// Filter for possible heroes
.filter_map(|u| u)
{
if heroes.contains(&hero) || hero == sender_id.as_str() {
continue;
}
heroes.push(hero);
}
}
(
Some(joined_member_count),
Some(invited_member_count),
heroes,
)
} else {
(None, None, Vec::new())
};
let notification_count = if send_notification_counts {
if let Some(last_read) = db.rooms.edus.room_read_get(&room_id, &sender_id)? {
Some(
(db.rooms
.pdus_since(&sender_id, &room_id, last_read)?
.filter_map(|pdu| pdu.ok()) // Filter out buggy events
.filter(|pdu| {
matches!(
pdu.kind.clone(),
EventType::RoomMessage | EventType::RoomEncrypted
)
})
.count() as u32)
.into(),
)
} else {
None
}
} else {
None
};
let prev_batch = timeline_pdus.first().map_or(Ok::<_, Error>(None), |e| {
Ok(Some(
db.rooms
.get_pdu_count(&e.event_id)?
.ok_or_else(|| Error::bad_database("Can't find count from event in db."))?
.to_string(),
))
})?;
let room_events = timeline_pdus
.into_iter()
.map(|pdu| pdu.to_sync_room_event())
.collect::<Vec<_>>();
let mut edus = db
.rooms
.edus
.roomlatests_since(&room_id, since)?
.filter_map(|r| r.ok()) // Filter out buggy events
.collect::<Vec<_>>();
if db
.rooms
.edus
.last_roomactive_update(&room_id, &db.globals)?
> since
{
edus.push(
serde_json::from_str(
&serde_json::to_string(&AnySyncEphemeralRoomEvent::Typing(
db.rooms.edus.roomactives_all(&room_id)?,
))
.expect("event is valid, we just created it"),
)
.expect("event is valid, we just created it"),
);
}
let joined_room = sync_events::JoinedRoom {
account_data: sync_events::AccountData {
events: db
.account_data
.changes_since(Some(&room_id), &sender_id, since)?
.into_iter()
.filter_map(|(_, v)| {
serde_json::from_str(v.json().get())
.map_err(|_| Error::bad_database("Invalid account event in database."))
.ok()
})
.collect::<Vec<_>>(),
},
summary: sync_events::RoomSummary {
heroes,
joined_member_count: joined_member_count.map(|n| (n as u32).into()),
invited_member_count: invited_member_count.map(|n| (n as u32).into()),
},
unread_notifications: sync_events::UnreadNotificationsCount {
highlight_count: None,
notification_count,
},
timeline: sync_events::Timeline {
limited: limited || joined_since_last_sync,
prev_batch,
events: room_events,
},
// TODO: state before timeline
state: sync_events::State {
events: if joined_since_last_sync {
db.rooms
.room_state_full(&room_id)?
.into_iter()
.map(|(_, pdu)| pdu.to_sync_state_event())
.collect()
} else {
Vec::new()
},
},
ephemeral: sync_events::Ephemeral { events: edus },
};
if !joined_room.is_empty() {
joined_rooms.insert(room_id.clone(), joined_room);
}
// Take presence updates from this room
for (user_id, presence) in
db.rooms
.edus
.presence_since(&room_id, since, &db.rooms, &db.globals)?
{
match presence_updates.entry(user_id) {
hash_map::Entry::Vacant(v) => {
v.insert(presence);
}
hash_map::Entry::Occupied(mut o) => {
let p = o.get_mut();
// Update existing presence event with more info
p.content.presence = presence.content.presence;
if let Some(status_msg) = presence.content.status_msg {
p.content.status_msg = Some(status_msg);
}
if let Some(last_active_ago) = presence.content.last_active_ago {
p.content.last_active_ago = Some(last_active_ago);
}
if let Some(displayname) = presence.content.displayname {
p.content.displayname = Some(displayname);
}
if let Some(avatar_url) = presence.content.avatar_url {
p.content.avatar_url = Some(avatar_url);
}
if let Some(currently_active) = presence.content.currently_active {
p.content.currently_active = Some(currently_active);
}
}
}
}
}
let mut left_rooms = BTreeMap::new();
for room_id in db.rooms.rooms_left(&sender_id) {
let room_id = room_id?;
let pdus = db.rooms.pdus_since(&sender_id, &room_id, since)?;
let room_events = pdus
.filter_map(|pdu| pdu.ok()) // Filter out buggy events
.map(|pdu| pdu.to_sync_room_event())
.collect();
let left_room = sync_events::LeftRoom {
account_data: sync_events::AccountData { events: Vec::new() },
timeline: sync_events::Timeline {
limited: false,
prev_batch: Some(next_batch.clone()),
events: room_events,
},
state: sync_events::State { events: Vec::new() },
};
let mut left_since_last_sync = false;
for pdu in db.rooms.pdus_since(&sender_id, &room_id, since)? {
let pdu = pdu?;
if pdu.kind == EventType::RoomMember && pdu.state_key == Some(sender_id.to_string()) {
let content = serde_json::from_value::<
Raw<ruma::events::room::member::MemberEventContent>,
>(pdu.content.clone())
.expect("Raw::from_value always works")
.deserialize()
.map_err(|_| Error::bad_database("Invalid PDU in database."))?;
if content.membership == MembershipState::Leave {
left_since_last_sync = true;
break;
}
}
}
if left_since_last_sync {
device_list_left.extend(
db.rooms
.room_members(&room_id)
.filter_map(|user_id| {
Some(
UserId::try_from(user_id.ok()?.clone())
.map_err(|_| {
Error::bad_database("Invalid member event state key in db.")
})
.ok()?,
)
})
.filter(|user_id| {
// Don't send key updates from the sender to the sender
sender_id != user_id
})
.filter(|user_id| {
// Only send if the sender doesn't share any encrypted room with the target
// anymore
!share_encrypted_room(&db, sender_id, user_id, &room_id)
}),
);
}
if !left_room.is_empty() {
left_rooms.insert(room_id.clone(), left_room);
}
}
let mut invited_rooms = BTreeMap::new();
for room_id in db.rooms.rooms_invited(&sender_id) {
let room_id = room_id?;
let mut invited_since_last_sync = false;
for pdu in db.rooms.pdus_since(&sender_id, &room_id, since)? {
let pdu = pdu?;
if pdu.kind == EventType::RoomMember && pdu.state_key == Some(sender_id.to_string()) {
let content = serde_json::from_value::<
Raw<ruma::events::room::member::MemberEventContent>,
>(pdu.content.clone())
.expect("Raw::from_value always works")
.deserialize()
.map_err(|_| Error::bad_database("Invalid PDU in database."))?;
if content.membership == MembershipState::Invite {
invited_since_last_sync = true;
break;
}
}
}
if !invited_since_last_sync {
continue;
}
let invited_room = sync_events::InvitedRoom {
invite_state: sync_events::InviteState {
events: db
.rooms
.room_state_full(&room_id)?
.into_iter()
.map(|(_, pdu)| pdu.to_stripped_state_event())
.collect(),
},
};
if !invited_room.is_empty() {
invited_rooms.insert(room_id.clone(), invited_room);
}
}
for user_id in left_encrypted_users {
// If the user doesn't share an encrypted room with the target anymore, we need to tell
// them
if db
.rooms
.get_shared_rooms(vec![sender_id.clone(), user_id.clone()])
.filter_map(|r| r.ok())
.filter_map(|other_room_id| {
Some(
db.rooms
.room_state_get(&other_room_id, &EventType::RoomEncryption, "")
.ok()?
.is_some(),
)
})
.all(|encrypted| !encrypted)
{
device_list_left.insert(user_id);
}
}
// Remove all to-device events the device received *last time*
db.users
.remove_to_device_events(sender_id, device_id, since)?;
let response = sync_events::Response {
next_batch,
rooms: sync_events::Rooms {
leave: left_rooms,
join: joined_rooms,
invite: invited_rooms,
},
presence: sync_events::Presence {
events: presence_updates
.into_iter()
.map(|(_, v)| Raw::from(v))
.collect(),
},
account_data: sync_events::AccountData {
events: db
.account_data
.changes_since(None, &sender_id, since)?
.into_iter()
.filter_map(|(_, v)| {
serde_json::from_str(v.json().get())
.map_err(|_| Error::bad_database("Invalid account event in database."))
.ok()
})
.collect::<Vec<_>>(),
},
device_lists: sync_events::DeviceLists {
changed: device_list_updates.into_iter().collect(),
left: device_list_left.into_iter().collect(),
},
device_one_time_keys_count: if db.users.last_one_time_keys_update(sender_id)? > since {
db.users.count_one_time_keys(sender_id, device_id)?
} else {
BTreeMap::new()
},
to_device: sync_events::ToDevice {
events: db.users.get_to_device_events(sender_id, device_id)?,
},
};
// TODO: Retry the endpoint instead of returning (waiting for #118)
if !body.full_state
&& response.rooms.is_empty()
&& response.presence.is_empty()
&& response.account_data.is_empty()
&& response.device_lists.is_empty()
&& response.device_one_time_keys_count.is_empty()
&& response.to_device.is_empty()
{
// Hang a few seconds so requests are not spammed
// Stop hanging if new info arrives
let mut duration = body.timeout.unwrap_or_default();
if duration.as_secs() > 30 {
duration = Duration::from_secs(30);
}
let mut delay = tokio::time::delay_for(duration);
tokio::select! {
_ = &mut delay => {}
_ = watcher => {}
}
}
Ok(response.into())
}
fn share_encrypted_room(
db: &Database,
sender_id: &UserId,
user_id: &UserId,
ignore_room: &RoomId,
) -> bool {
db.rooms
.get_shared_rooms(vec![sender_id.clone(), user_id.clone()])
.filter_map(|r| r.ok())
.filter(|room_id| room_id != ignore_room)
.filter_map(|other_room_id| {
Some(
db.rooms
.room_state_get(&other_room_id, &EventType::RoomEncryption, "")
.ok()?
.is_some(),
)
})
.any(|encrypted| encrypted)
}